xen/arm: enable PV control for ARM

Enable lifecyle management (reboot, shutdown...) from the toolstack
for ARM guests.
Signed-off-by: NJulien Grall <julien.grall@linaro.org>
Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: NStefano Stabellini <stefano.stabellini@eu.citrix.com>

drivers/xen/Makefile

 ifeq ($(filter y, $(CONFIG_ARM) $(CONFIG_ARM64)),)
-obj-y	+= manage.o
 obj-$(CONFIG_HOTPLUG_CPU)		+= cpu_hotplug.o
 endif
 obj-$(CONFIG_X86)			+= fallback.o
-obj-y	+= grant-table.o features.o events.o balloon.o
+obj-y	+= grant-table.o features.o events.o balloon.o manage.o
 obj-y	+= xenbus/
 
 nostackp := $(call cc-option, -fno-stack-protector)